Lifetime measurements in $^{63}$Co and $^{65}$Co

Details Lifetime measurements in $^{63}$Co and $^{65}$Co Lifetime measurements in $^{63}$Co and $^{65}$Co

2011-06-14

arxiv.org/abs/1106.2728v1

Phys.Rev.C83:064321,2011

Physics

Nuclear Physics

Nuclear Experiment

8 pages, 8 figures, 1 table, accepted for publication in Physical Review C

Scientific paper

10.1103/PhysRevC.83.064321

Lifetimes of the $9/2^-_1$ and $3/2^-_1$ states in $^{63}$Co and the $9/2^-_1$ state in $^{65}$Co were measured using the recoil distance Doppler shift and the differential decay curve methods. The nuclei were populated by multi-nucleon transfer reactions in inverse kinematics. Gamma rays were measured with the EXOGAM Ge array and the recoiling fragments were fully identified using the large-acceptance VAMOS spectrometer. The E2 transition probabilities from the $3/2^-_1$ and $9/2^-_1$ states to the $7/2^-$ ground state could be extracted in $^{63}$Co as well as an upper limit for the $9/2^-_1\rightarrow7/2^-_1$ $B$(E2) value in $^{65}$Co. The experimental results were compared to large-scale shell-model calculations in the $pf$ and $pfg_{9/2}$ model spaces, allowing to draw conclusions on the single-particle or collective nature of the various states.

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